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#gnss

2 posts2 participants0 posts today
Public
RTN

#DLR:
"
EU-Forschungsprojekt RailGap
Satellitennavigation für den Zugverkehr besser nutzbar machen
"
"Das DLR untersuchte im EU-Projekt RailGap, wie sich Satellitennavigation für die Lokalisierung von Zügen einsetzen lässt.
Eine Herausforderung dabei ist die sogenannte Mehrwegeausbreitung von Satellitensignalen. .."

dlr.de/de/aktuelles/nachrichte

1.4.2025

www.dlr.deSatellitennavigation für Züge besser nutzbar machenDas DLR untersuchte im EU-Projekt RailGap, wie sich Satellitennavigation für die Lokalisierung von Zügen einsetzen lässt. Eine Herausforderung dabei ist die sogenannte Mehrwegeausbreitung von Satellitensignalen. Darunter versteht man, dass das Signal von Gebäuden, Schieneninfrastruktur oder der natürlichen Umgebung reflektiert wird.
#ADIF#Eisenbahn#ETCS
Replied in thread
Public
Matija Nalis

@markd @revk @nowster @jasonkarns @jjcelery Another issue with using GPS to distribute tzdata is that many IoT devices are inside buildings, and #GNSS works really badly (or not at all) unless you have a line-of-sight to satellites. Another is that (unless your device already needs the GPS chip for its other functions) that it is unnecessary increasing hardware cost. And Internet-of-Things things are usually connected to Internet, so updating tzdata via Internet is literally single line of code.

Replied in thread
Public *
Matija Nalis

@markd @revk @nowster @jasonkarns @jjcelery Not really, SBAS bandwidth is only marginally better (at 250bps, and obviously, you'd only get a percentage of that). Also, "diffs" and "git" ideas won't work, as #GNSS user-segment is unidirectional (i.e. receive-only) and you need bidirectional comms for them to work out what diffs are needed. And anyway, as IoT motto is least-effort, and they can't be bothered to do tzdata 'net update, I wouldn't hold much hope even if SBAS were to broadcast it...

Public
Ted Pavlic (he/him)

Yes, Virginia, there are #GPS signals on the #moon. After Firefly Aerospace's #BlueGhost landed on the moon's surface earlier this week, the on-board #LuGRE project demonstrated that GPS signals from earth's man-made satellites could also be used for localization on the moon. Sets the record for highest altitude #GNSS signal acquisition!
#NASA
nasa.gov/general/nasa-successf

An artist's concept of the LuGRE payload on Blue Ghost and its three main records in transit to the Moon, in lunar orbit and on the Moon's surface.
NASA · NASA Successfully Acquires GPS Signals on Moon  - NASANASA and the Italian Space Agency made history on March 3, when the Lunar GNSS Receiver Experiment (LuGRE) became the first technology demonstration to
Public
Jon PENNYCOOK

They like to use the word "quantum" a lot, but it sounds a bit like dead reckoning. / relies on very weak signals - could we not just use a system like which has stronger localised transmitters?

bbc.co.uk/news/articles/cq6yg2

"While GPS is satellite-based, the new system is quantum-based - a term used to describe tech that is reliant on the properties of matter at very small scales."

bbc.co.uk/news/articles/cz744g

en.wikipedia.org/wiki/ELoran

A digitally edited image of a plane set against a background featuring a compass
BBC NewsPlane GPS systems are under sustained attack - is the solution a new atomic clock?How a new atomic clock might be the way to tackle attacks on plane GPS systems
#navigation#airTravel#planes
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